Cer2 is a LTR retrotransposon described from sequencing data in the chromosome II of Caenorhabditis elegans (Bowen and McDonald 1999).Along with Cer3, this element constitutes Cer2-3 clade, a small clade of Ty3/Gypsy-like LTR retroelements. The genomic structure of Cer2 is 9.8 Kb in size including LTRs of 646 nt. The internal region of this element displays a Primer Binding Site (PBS) complementary to a tRNAGly, three Open Reading Frames (ORFs) for the gag-pro, pol, and int genes, and a Polypurine Tract (PPT) adjacent to the 3´LTR (Bowen and McDonald 1999; Ganko, Fielman and McDonald 2001).
Figure not to scale. If present, long terminal repeats (LTRs) have been highlighted in blue. Amino acid motifs noted with lines indicate the conserved residues in each protein domain, abbreviations below mean:
||DU or DUT=dUTPase
||TAV or IBMP=transactivator/viroplasmin or inclusion body matrix protein
||PBS=primer binding site
||ATF=aphid transmission factor
||VAP=virion associated protein